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The event going ahead removes previous concerns it may have had to have been contested as a duathlon - with just swimming and cycling - as a last resort.

Friday remains a back-up date for both races and, as a last resort, organisers say the event could be contested as a duathlon - just the cycling and running legs.

If the water quality is still not good enough by Friday, organisers have said the event could be contested as a duathlon - just the cycling and running legs - as a last resort.

While a mixed relay was added in Tokyo three years ago, there has never been a duathlon in the Olympics to date.

However, at the Paris Test Event in 2023, a duathlon format was trialled, with the swim replaced by an additional 5km run.